Swiss SV Number Validation / AHV Nummer Validierung (see https://www.bsv.admin.ch/bsv/de/home/sozialversicherungen/ahv/grundlagen-gesetze/ahv-nummer.html)

svNumberValidation.js

function isValidateSVNumber(toValidate) {
    const number = toValidate.replaceAll('.', '');
    if (number.length < 13) {
        return false;
    }
    const parts = number.split('');
    const checksum = parseInt(parts[parts.length - 1]);
    const sum = parts.reverse().slice(1).reduce((sum, number, index) => {
        if (index % 2 === 0) {
            return sum + parseInt(number) * 3;
        }
        return sum + parseInt(number);
    }, 0);
    return (sum + checksum) % 10 === 0;
}